钾盐矿山巷道的稳定性在很大程度上取决于直接顶板的构造,即取决于是否存在大量的与相当厚(达20厘米)的含盐粘土层互层的盐岩夹层。在采矿影响带内这种特别容易发生弯曲的层状顶板,一开始就会在一定厚度上产生离层,出现若干独立的分层,下部各分层达到极限拉应力后即发生碎裂和冒顶。 The stability of the potash mine roadway depends very much on the construction of the direct roof, ie on the presence or absence of a large number of salt interbed layers interbedded with relatively thick (up to 20 cm) salt-bearing clay layers. In the mining zone of influence, this particularly prone to bending layered roof, from the beginning there will be a certain thickness of the delamination, there are several independent stratification, the lower stratification reaches the ultimate tensile stress after the occurrence of fragmentation and roof fall .